Class NoBackground
- java.lang.Object
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- ej.mwt.style.background.NoBackground
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- All Implemented Interfaces:
Background
public final class NoBackground extends java.lang.Object implements Background
A transparent background.
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Field Summary
Fields Modifier and Type Field Description static NoBackground
NO_BACKGROUND
No background singleton to avoid creating several ones.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
apply(ej.microui.display.GraphicsContext g, int width, int height)
Applies the background on a graphics context.boolean
equals(java.lang.Object obj)
Indicates whether some other object is "equal to" this one.int
hashCode()
Returns a hash code value for the object.boolean
isTransparent(int width, int height)
Tells whether or not this background is transparent.
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Field Detail
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NO_BACKGROUND
public static final NoBackground NO_BACKGROUND
No background singleton to avoid creating several ones.
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Method Detail
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isTransparent
public boolean isTransparent(int width, int height)
Description copied from interface:Background
Tells whether or not this background is transparent.A background is considered as transparent if it does not draw every pixel with maximal opacity when it is applied. If a widget has a transparent background, its parent has to be rendered before the widget.
- Specified by:
isTransparent
in interfaceBackground
- Parameters:
width
- the width of the background.height
- the height of the background.- Returns:
true
if the background is transparent,false
otherwise.
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apply
public void apply(ej.microui.display.GraphicsContext g, int width, int height)
Description copied from interface:Background
Applies the background on a graphics context.- Specified by:
apply
in interfaceBackground
- Parameters:
g
- the graphics context.width
- the width of the background.height
- the height of the background.
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equals
public boolean equals(@Nullable java.lang.Object obj)
Description copied from class:java.lang.Object
Indicates whether some other object is "equal to" this one.The
equals
method implements an equivalence relation on non-null object references:- It is reflexive: for any non-null reference value
x
,x.equals(x)
should returntrue
. - It is symmetric: for any non-null reference values
x
andy
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any non-null reference values
x
,y
, andz
, ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
. - It is consistent: for any non-null reference values
x
andy
, multiple invocations ofx.equals(y)
consistently returntrue
or consistently returnfalse
, provided no information used inequals
comparisons on the objects is modified. - For any non-null reference value
x
,x.equals(null)
should returnfalse
.
The
equals
method for classObject
implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference valuesx
andy
, this method returnstrue
if and only ifx
andy
refer to the same object (x == y
has the valuetrue
).Note that it is generally necessary to override the
hashCode
method whenever this method is overridden, so as to maintain the general contract for thehashCode
method, which states that equal objects must have equal hash codes.- Specified by:
equals
in interfaceBackground
- Overrides:
equals
in classjava.lang.Object
- Parameters:
obj
- the reference object with which to compare.- Returns:
true
if this object is the same as the obj argument;false
otherwise.- See Also:
Object.hashCode()
,HashMap
- It is reflexive: for any non-null reference value
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hashCode
public int hashCode()
Description copied from class:java.lang.Object
Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided byHashMap
.The general contract of
hashCode
is:- Whenever it is invoked on the same object more than once during an execution of a Java
application, the
hashCode
method must consistently return the same integer, provided no information used inequals
comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. - If two objects are equal according to the
equals(Object)
method, then calling thehashCode
method on each of the two objects must produce the same integer result. - It is not required that if two objects are unequal according to the
Object.equals(java.lang.Object)
method, then calling thehashCode
method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by class
Object
does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)- Specified by:
hashCode
in interfaceBackground
- Overrides:
hashCode
in classjava.lang.Object
- Returns:
- a hash code value for this object.
- See Also:
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
- Whenever it is invoked on the same object more than once during an execution of a Java
application, the
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